Why are you asking? Do you intend to connect several of these matrix pieces together? You don't really want to drive more than 256 WS2811 LEDs at one data line. It becomes to slow for soft animations. Every RGB LED takes 30 µS for an update. That means with the shown setup the physical limitation is 130 fps. Not much for smooth fading...

Large numbers of LEDs are driven with parallel output like with the OctoWS2811 lib + a Teensy.

I believe you mean SOUND => LIGHT converter...In the 60's we called that a COLOR ORGAN. In the UK , being British, they could not he heard using our American term so they dubbed them SOUND TO LIGHT converter's . (how original huh ?)